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That sounds like a lot of spring for a flat tappet. Is the cam or lifters specially hardened? Not criticizing hear, just haven't heard of that much spring on flat tappets.

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Yes they are hardened...I am told, they really don't need a break in , and I can go cam to cam with them....Apparently, they have logged many thousands of street and strip miles on these with very good results and little to no failure in a lot of big inch Hemis...Give him a call if you don't believe me. I have a friend that lost his 493 at the end of the season due to a roller lifter failure...I am not going there. My buddy is running it in his 572 hemi, so it can't be that bad.

New carb showed up....And I picked up the new intake...Its big!

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Good info.
Being able to run springs like that, rpms ought to be no problem, course, your gonna have enough torque to through the earth orbit off a bit